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A soap film becomes gradually thicker towards the bottom. We are continuing to represent the light as an electromagnetic wave. For the sake of simplicity, we will only take into consideration the electric field component. Let us recall the representation of an acoustic wave. In a similar way, we can also describe a given wavelength λ from the light spectrum. In order to do so, we need a frequency, an amplitude and a phase.
For the colour red with the wavelength λ = 650 nanometres, the rotation frequency amounts to approximately 4.6 x 10^14 revolutions per second.
We determine the amplitude which corresponds to the radius R of the rotating wheel from the square root of the incident light intensity I_0.
Is it possible to determine the increase in the thickness of the soap film from one red stripe to the next?
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